[clang] [RISCV] Fix wrong implication for zvknhb. (PR #66860)

[Brandon Wu via cfe-commits]

================
@@ -599,15 +599,21 @@ def HasStdExtZvkned : 
Predicate<"Subtarget->hasStdExtZvkned()">,
 def FeatureStdExtZvknha
     : SubtargetFeature<"experimental-zvknha", "HasStdExtZvknha", "true",
                        "'Zvknha' (Vector SHA-2 (SHA-256 only))">;
-
-def FeatureStdExtZvknhb
-    : SubtargetFeature<"experimental-zvknhb", "HasStdExtZvknhb", "true",
-                       "'Zvknhb' (Vector SHA-2 (SHA-256 and SHA-512))",
-                       [FeatureStdExtZvknha]>;
 def HasStdExtZvknha : Predicate<"Subtarget->hasStdExtZvknha()">,
                                 AssemblerPredicate<(all_of 
FeatureStdExtZvknha),
                                 "'Zvknha' (Vector SHA-2 (SHA-256 only))">;
 
+def FeatureStdExtZvknhb
+    : SubtargetFeature<"experimental-zvknhb", "HasStdExtZvknhb", "true",
+                       "'Zvknhb' (Vector SHA-2 (SHA-256 and SHA-512))">;
----------------
4vtomat wrote:

And I should also remove these 
[checks](https://github.com/llvm/llvm-project/blob/69074bf144c1bf54040d289584e3d1d54f883a37/llvm/lib/Support/RISCVISAInfo.cpp#L940C1-L940C1)
 and add them to **ImpliedExts***?

https://github.com/llvm/llvm-project/pull/66860
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